SYNTHESIS, STRUCTURE AND SPECTROSCOPIC PROPERTIES OF COMPLEXES OF RARE EARTH DITHIOCARBAMATES WITH 2,2′-BIPYRIDYL OR 1, 10-PHENANTHROLINE

Abstract

Abstract Two series of rare earth complexes with the general formula [RE(Me2Dtc)3(bipy)](RE = La,Pr,Nd,Sm-Yb,Y;Me2Dtc = N,N-dimethyldithiocarbamate; bipy = 2,2′-bipyridyl) and [RE(Et2-Dtc)3(phen)](RE = La,Pr,Nd,Sm-Lu,Y;Et2Dtc = N,N-diethyldithiocarbamate; phen = 1, 10-phenanthroline) have been prepared and some of their chemical properties, IR spectra, electronic spectra and conductivity properties are reported. The structures of [Eu(Me2Dtc)3(bipy)] and [Eu(Et2Dtc)3(phen)] have been determined by single-crystal X-ray diffraction methods. [Eu(Me2Dtc)3(bipy)] crystallizes in the tetragonal system, space group I41/a with a = 16.753(1), c = 39.523(3) Å and Z = 16, while [Eu(Et2Dtc)3(phen)] crystallizes in the monoclinic system, space group P21/c with a = 17.029(3), b = 10.652(3), c = 18.726(3) Å, β = 96.41(4)° and Z = 4. The central Eu(III) atoms are both octa-coordinated and in a distorted square antiprismatic geometry, each being coordinated to six sulphur atoms of three bidentate dithiocarbamates and to two nitrogen atoms of bipy or phen ligands. Spectrum analyses indicate that both Me2Dtc and Et2Dtc show similar coordination structures in all complexes.